CN102107536B - Forming equipment and forming method for macrofiber-reinforced thermoplastic resin - Google Patents

Abstract

The invention discloses a long-fiber-reinforced thermoplastic resin molding device, which includes: a device for decomposing fiber loops into fiber bundles and pretreating them; the independent channel of the fiber bundles is connected with a fiber pre-fluffing and preheating system; the molten resin fully impregnates the fibers And forming equipment, the melt inlet die communicates with the fiber impregnated body through the melt inflow channel, and is inclined upward at a certain angle. The fiber inlet die is used to connect the fiber pre-fluffing and preheating system and the fiber impregnated body, which can make the fiber level Enter the fiber impregnated body, and the other end of the fiber impregnated body is connected with the forming die. Its preparation method includes: (1) After 20~40 bundles of fibers pass through their own independent channels, they enter the fiber pre-fluffing and preheating system in the form of a "one" line. When the fiber bundles pass through the preheating guide roller, the fibers and The surface of the guide roller is in contact with the circular arc, and under the stretching effect of the traction force, the fiber bundles are in the shape of cloth or ribbon, and the fiber bundles play a role in pre-fluffing treatment; (2) The pre-fluffing and preheated fiber bundles are drawn horizontally into the fiber inlet After the fiber of the mold and the impregnated body enters the hole, it passes through the fiber tension roller in the impregnated body staggered up and down, and the fiber bundle is in the shape of cloth or ribbon when it contacts the fiber tension roller; (3) The soaked long fiber passes through the impregnated body together with the material flow The output runner and forming die. The advantage is that longer fiber resins can be obtained while reducing costs.

Description

Molding equipment and molding method of long fiber reinforced thermoplastic resin

technical field

The present invention relates to a long-fiber-reinforced thermoplastic resin molding equipment, specifically, including fiber loops decomposed into fiber bundles and pretreatment equipment, molten resin fully impregnating and forming equipment for fibers; the present invention also relates to a long-fiber-reinforced thermoplastic resin Resin molding method.

Background technique

Long fiber reinforced thermoplastic resin means that the fiber orientation is completely in the same direction, and the length of the obtained fiber is consistent with the length of the plastic particle. Compared with fiber-reinforced resins prepared by conventional methods, it has better mechanical properties, endows products with higher stiffness, strength, impact resistance, creep resistance and better microscopic quality. In the automotive industry, home appliances, machinery and other places, it can replace some cast iron, aluminum and thermosetting plastics, etc., which can effectively reduce the weight and manufacturing cost of the product.

At present, the melt impregnation method is the main method of long fiber reinforced thermoplastic resin. The process is to introduce the continuous long fiber into an impregnation body with a special structure under the traction of tension, and at the same time, the plastic melt input from the extruder will be The imported long fiber is soaked, and then the long fiber is pulled out from the die of the impregnated body, and after cooling, it is cut into pellets of required length. However, the published patents all have some common defects: 1) The resin has poor impregnation effect on the fiber, and the fiber is easy to break when passing through the impregnated body, thus affecting the quality and production efficiency of the product; 2) The impregnated body and the melt inlet die , the fiber inlet die, and the shaping die are integrated, and the cost is relatively high when the above-mentioned die flow path needs to be replaced due to wear and tear. Therefore, fiber impregnation equipment and fiber drawing methods are required to be improved.

Chinese patent 200680049562.9 discloses a long-fiber-reinforced thermoplastic resin material manufacturing device and its manufacturing method. The impregnation mold has an impregnation chamber for accommodating molten thermoplastic resin, and a resin for supplying thermoplastic resin to the impregnation chamber. A supply passage, an inlet plate provided on the upstream side of the impregnation chamber, and a plurality of pullers for drawing fiber bundles impregnated with molten thermoplastic resin to the outside toward the outlet plate on the downstream side of the impregnation chamber. The holes are drawn, and each introduction hole of the entrance plate is provided with a gate on the outside of the entrance plate, which can open and close each introduction hole respectively.

Chinese patent 200610122459.4 discloses a continuous long fiber reinforced thermoplastic resin molding method and its molding equipment, including a melt impregnation mold, the melt impregnation mold includes an impregnated outer body and a thermoplastic resin melt in the impregnated outer body. Body gap flow channel, impregnation independent flow channel, continuous long fiber inlet channel and impregnation outlet, the thermoplastic resin melt gap flow channel is set at the upstream end of the impregnation mold outer body, and the impregnation outlet is set at the downstream end of the impregnation equipment outer body and It communicates with the end of the independent impregnation flow channel, and at least one set of freely rotatable tension rollers is arranged in the independent impregnation flow channel.

Chinese patent 201010105774.2 discloses a long-fiber-reinforced thermoplastic resin manufacturing device, including a melt impregnation chamber, which contains a resin melt for impregnating fiber bundles, and a fiber bundle inlet is provided on one side wall of the melt impregnation chamber. Fiber bundle outlets are provided on the side wall of the melt impregnation chamber opposite to the side wall where fiber bundle inlets are provided, and the number of fiber bundle outlets is smaller than the number of fiber bundle inlets. The reinforced fiber resin bundles are reinforced fiber resin molding materials.

The disadvantages of the above-mentioned prior patents are that (1) the molten resin enters the impregnated body in a horizontal manner, and the length of the long fibers in the shape of cloth or tape is slightly longer than the contact length, and the fibers at the non-contact point of the curved channel are subjected to tensile force However, it quickly returns to the round bundle shape, which reduces the infiltration effect of the molten resin on the circular bundle-shaped central fiber; (2) The fiber bundle is bonded together by many fiber filaments to affect the infiltration effect of the molten resin on the fiber; (3) Fiber and resin If the temperature difference is too large, it will cause poor infiltration of the fiber; (4) The fiber inlet die flow channel, the melt inlet die flow channel, the impregnation flow channel and the shaping die flow channel are an integral part, which is easy to cause equipment wear , so that the entire impregnated body needs to be replaced, wasting installation costs.

Contents of the invention

The purpose of the present invention is to overcome various defects in the existing long-fiber-reinforced thermoplastic resin preparation equipment, and provide a long-fiber-reinforced thermoplastic resin equipment that can stably produce long-fiber-reinforced thermoplastic resin with ideal infiltration effect for fiber bundles.

Another object of the present invention is to provide a production method capable of improving the production efficiency and quality of long fiber reinforced thermoplastic resin products.

Molding equipment for long fiber reinforced thermoplastic resins, including:

Fiber loops are decomposed into fiber bundles and pretreated, and the fiber bundle independent channel is connected to the fiber pre-fluffing and preheating system;

The molten resin fully impregnates the fiber and forms the equipment. The melt inlet die communicates with the fiber impregnated body through the melt inflow channel, and is inclined upward at a certain angle. The fiber inlet die is used to connect the fiber pre-fluffing and preheating system and fiber impregnation. The body can make the fiber enter the fiber impregnated body horizontally, and the other end of the fiber impregnated body is connected with the forming die.

In addition, the melt inlet die, fiber inlet die, forming die and fiber impregnated body can be disassembled and flexibly combined; the fiber bundle independent channel is a fiber conduit; the fiber independent channel is distributed in 1-4 layers, Each layer of fiber bundle passages is developed side by side; the fiber pre-fluffing and preheating system includes pre-fluffing and preheating guide rollers or a support frame that can adjust the height and distance of the guide rollers; the fiber pre-fluffing and preheating guide rollers have 4 ~6 groups, there are 15~40 arc-shaped small grooves on the surface along the circumferential direction of the guide roller, and the center distance between each guide groove is 15~22mm; the fiber pre-fluffing and preheating guide rollers are electric heating or oil heating Heating, the preheating temperature is 80~250℃; the height and horizontal distance of the pre-fluffing and preheating guide rollers can be adjusted freely; the melt inlet die and the horizontal form an oblique angle of 30°~45°; the fiber impregnated body passes through the fiber The input channel is connected to the fiber inlet die, and there is a fiber tension roller in the cavity of the fiber impregnation body, the other end of which is connected to the forming die through the output channel; the cross section of the fiber input channel is circular, with a diameter of 2~5mm; The cross-section of the output flow channel of the impregnated body is circular with a diameter of 2.5~5mm; the cross-section of the fiber tension roller has 2~6 arc-shaped or concave polygonal small grooves with concave characteristics; the forming die passes through the bolt It is fixed on the outer wall of the fiber impregnated body and can be disassembled and replaced freely. There is also a resin collection device on the outside of the forming die; the cross section of the flow channel of the forming die is circular, and the diameter of the cross section decreases gradually along the direction of melt flow. Small, the diameter of the initial section is 3~5mm, and the diameter of the end section is 2.5mm~3.5mm; the outer surface of the die mouth of the forming die is at an angle of 15°~60°downward to the vertical direction, and the mouth on the exit surface There are small grooves between the die holes.

The molten resin fully impregnates the fiber and the molding equipment, the fiber enters the fiber entrance die of the impregnated body, the molten resin infiltrates the fiber impregnated body, the tension roller increases the fiber impregnation performance, the molten resin enters the die, and the shaping die. The fiber inlet die, the molten resin inlet die and the shaping die are assembled on the outside of the impregnated body by bolts through the fixed structure. The die is installed under the impregnated body, and the direction of the flow channel is 30~45° horizontally upward. The tension roller group is installed in the dipping body, the cross section of the tension roller is concave in the circular arc shape or the concave polygonal small groove, and the outer surface of the tension roller has 20~40 concave arc grooves. The impregnation body is composed of a fiber input hole, a melt input channel, an impregnation cavity and a material flow output hole. Along the direction of melt flow, the section of the impregnation cavity is trapezoidal, and the melt flows into the impregnation cavity from the bottom surface of the impregnation body.

A method for preparing a long fiber reinforced thermoplastic resin, comprising:

(1) After 20~40 bundles of fibers pass through their respective independent channels, they enter the fiber pre-fluffing and preheating system in the form of a "one" line. When the fiber bundles pass through the preheating guide roller, the fiber is in contact with the arc surface of the guide roller. , under the stretching action of the traction force, the fiber bundles are in the shape of cloth or ribbon, and the fiber bundles play the role of pre-fluffing treatment;

(2) The pre-fluffed and preheated fiber bundles are drawn horizontally into the fiber inlet die and impregnated body fibers into the holes, and then crossed up and down through the fiber tension rollers in the impregnated body. The fiber bundles are cloth-like or in contact with the fiber tension rollers Ribbon;

(3) The infiltrated long fibers pass through the output channel of the impregnated body and the forming die together with the material flow.

In addition, the fiber pre-fluffing and preheating guide rollers can be heated by electricity or oil, and the preheating temperature is 80-250°C.

In the first step, when the fiber bundles pass through the preheating guide roller, the fibers are in contact with the arc surface of the guide roller, and under the stretching action of the traction force, the fiber bundles are in the shape of cloth or ribbon, and the fiber bundles play a role of pre-fluffing treatment. The pre-fluffing treatment is not only conducive to the better transfer of heat energy of the preheating guide roll to the central area of the fiber bundle, but also improves the subsequent infiltration efficiency;

In the second step, the molten resin can better infiltrate into the central area of the fiber. Due to the special structure of the tension roller of the present invention, when the fiber bundle passes through a tension roller, it is at least twice in contact with the tension roller, and can make both The fiber bundles between the contact points are always in the shape of cloth or ribbon, which greatly improves the fiber wetting efficiency, and can ensure the fiber wetting effect under the condition of reducing the fiber tension, so that the pulling speed of long fibers can be increased to achieve the purpose of increasing production capacity. The molten resin from the extruder flows into the impregnation chamber from bottom to top, and the gravity factor reduces the difference in material flow velocity between the central area and the edge area, so as to ensure that the material renewal speed in the center area and the edge area of the runner is as consistent as possible, and overcome the long edge area. Fiber-reinforced resin is prone to quality defects such as yellow lines.

In the third step, the operator can adjust the fiber content in the product by changing the diameter of the die. The shaping die is independent, so the cost of die replacement and installation can be greatly reduced. After the impregnated long fiber reinforced resin product is cooled, it is cut into the required length according to the needs of the market.

Compared with the prior art, the present invention has the following beneficial effects:

Ⅰ) The fibers to be treated are introduced in the way of fiber conduits, so that each bundle of long fibers can advance along an independent direction, avoiding interference between fiber bundles, and at the same time reducing the resistance of the fiber bundles during traction and reducing the length of long fibers The breakage ensures long-term continuous and stable production, and the long-fiber pulling speed can be easily increased within a certain range.

Ⅱ) The pre-fluffing and preheating system, and the addition of special-shaped tension rollers are sufficient to ensure the wetting effect of long fibers, so that the pulling speed of long fibers can be smoothly increased under the premise of ensuring the quality of fiber wetting, thereby improving production efficiency .

Ⅲ) The present invention adopts the method of feeding molten resin from bottom to top, which can reduce the difference between the material renewal speed in the edge area of the flow channel and the center area of the flow channel, and reduce the product defects of long fiber reinforced resin products with yellow lines at the edge; at the same time, the die is shaped The outlet surface of the outlet is set to incline downward to reduce the material flow overflowing from the shaping die and stay on the die, thereby affecting the exit of the die.

Ⅳ) The fiber inlet die, molten resin inlet die and shaping die are designed to be detachable. Compared with the integral impregnation die, the processing and use costs that need to be replaced due to wear can be greatly reduced.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 Schematic diagram of fully impregnating and forming equipment for fibers by molten resin;

Figure 3 is a schematic cross-sectional view of the shaping die.

Detailed ways

Embodiment one

As shown in Figure 1-3, the equipment for producing long fiber reinforced thermoplastic resin by melt impregnation method includes the equipment for decomposing fiber loops into fiber bundles and pretreatment, and the fiber bundle independent channel 1 is connected with fiber pre-fluffing and preheating system 2 ; Molten resin fully impregnates fibers and molding equipment, and its melt inlet die 6 communicates with the fiber impregnated body 5 through the melt inflow channel 12, and is inclined upward at a certain angle. The thermal system 2 and the fiber impregnated body 5 can make the fibers enter the fiber impregnated body 5 horizontally, and the other end of the fiber impregnated body 5 is connected with the forming die 8 .

In addition, the melt inlet die 6, the fiber inlet die 4, the forming die 8 and the fiber impregnated body 5 are detachable and flexibly combined; the fiber bundle independent channel 1 is a fiber conduit; the fiber independent channel 1 is 4-layer distribution, each layer of fiber bundle channel 1 is unfolded side by side; the fiber pre-fluffing and preheating system 2 includes pre-fluffing and preheating guide rollers 3 or a support frame that can adjust the height and distance of the guide rollers; the fiber pre-fluffing There are 6 groups with the preheating guide roller 3. There are 30 arc-shaped small grooves along the surface of the guide roller circumferential direction, and the center distance between each guide groove is 20mm; the fiber pre-fluffing and the preheating guide roller 3 are electric Heating or oil heating, the preheating temperature is 200°C; the height and horizontal distance of the pre-fluffing and preheating guide rollers 3 can be adjusted freely; the melt inlet die 6 is at an angle of 45° upward to the horizontal; the fiber impregnated body 5 passes through The fiber input flow channel is connected with the fiber inlet die, and the fiber tension roller 7 is arranged in the cavity 15 in the fiber impregnated body 5, and the other end thereof is connected with the forming die 8 through the output flow channel 14; the cross section of the fiber input flow channel is circular shape, diameter 5mm; the cross-section of the output channel 13 of the impregnated body is circular in diameter 5mm; the cross-section of the fiber tension roller 7 has 6 arc-shaped or concave polygonal small grooves with concave characteristics; the forming port The mold 8 is fixed on the outer wall of the fiber impregnated body 5 by bolts, and can be disassembled and replaced freely. There is also a resin collection device 9 on the outside of the forming die 8; the cross section of the flow channel of the forming die 8 is circular and flows along the melt direction, the diameter of the cross section gradually decreases, the diameter of the initial section is 5mm, and the diameter of the end section is 3.5mm; Have small groove 17 between die hole.

A method for preparing a long fiber reinforced thermoplastic resin, comprising:

(1) After 20 bundles of fibers pass through their respective independent channels, they enter the fiber pre-fluffing and preheating system 2 in the form of a "one" line. When the fiber bundles pass through the preheating guide roller 3, the fibers are in contact with the arc surface of the guide roller , under the stretching effect of the traction force, the fiber bundles are in the shape of cloth or ribbon, and the fiber bundles play a role of pre-fluffing treatment. The fiber pre-fluffing and preheating guide roller 3 can be heated by electricity or oil, and the preheating temperature is 200°C ;

(2) The pre-fluffed and preheated fiber bundles are drawn horizontally into the fiber entrance die 4. After the fibers of the impregnated body enter the hole, they cross up and down through the fiber tension roller 7 in the impregnated body. When the fiber bundles are in contact with the fiber tension roller 7, they are Cloth or ribbon;

(3) The infiltrated long fibers pass through the output channel 13 of the impregnated body and the forming die 8 together with the material flow.

Embodiment two

As shown in Figure 1-3, the equipment for producing long fiber reinforced thermoplastic resin by melt impregnation method includes the equipment for decomposing fiber loops into fiber bundles and pretreatment, and the fiber bundle independent channel 1 is connected with fiber pre-fluffing and preheating system 2 ; Molten resin fully impregnates fibers and molding equipment, and its melt inlet die 6 communicates with the fiber impregnated body 5 through the melt inflow channel 12, and is inclined upward at a certain angle. The thermal system 2 and the fiber impregnated body 5 can make the fibers enter the fiber impregnated body 5 horizontally, and the other end of the fiber impregnated body 5 is connected with the forming die 8 .

In addition, the melt inlet die 6, the fiber inlet die 4, the forming die 8 and the fiber impregnated body 5 are detachable and flexibly combined; the fiber bundle independent channel 1 is a fiber conduit; the fiber independent channel 1 is 4-layer distribution, each layer of fiber bundle channel 1 is unfolded side by side; the fiber pre-fluffing and preheating system 2 includes pre-fluffing and preheating guide rollers 3 or a support frame that can adjust the height and distance of the guide rollers; the fiber pre-fluffing There are 6 groups with the preheating guide roller 3, and 40 arc-shaped small grooves are opened on the surface of the guide roller circumferential direction, and the center distance between each guide groove is 22mm; the fiber pre-fluffing and the preheating guide roller 3 are electric Heating or oil heating, the preheating temperature is 250°C; the height and horizontal distance of the pre-fluffing and preheating guide rollers 3 can be adjusted freely; the melt inlet die 6 is at an angle of 30° upward to the horizontal; the fiber impregnated body 5 passes through The fiber input flow channel is connected with the fiber inlet die, and there is a fiber tension roller 7 in the cavity 15 in the fiber impregnated body 5, and the other end thereof is connected with the forming die 8 through the output flow channel 13; the cross section of the fiber input flow channel 16 is Circular shape with a diameter of 2 mm; the cross-section of the output flow channel 13 of the impregnated body is circular with a diameter of 2 mm; the cross-section of the fiber tension roller 7 has 6 arc-shaped or concave polygonal small grooves with concave characteristics; forming The die 8 is fixed on the outer wall of the fiber impregnated body 5 by bolts, and can be disassembled and replaced freely. There is also a resin collection device 9 on the outside of the forming die 8; the cross section of the flow channel of the forming die 8 is circular, and In the flow direction, the diameter of the cross section decreases gradually, the diameter of the initial section is 3mm, and the diameter of the end section is 2.5mm; Have small groove 17 between the die holes.

In the preparation method, the fiber pre-fluffing and pre-heating guide roller 3 can be heated by electricity or oil, and the pre-heating temperature is 250° C., and the rest are the same as the first embodiment.

Embodiment Three

As shown in Figure 1-3, the equipment for producing long fiber reinforced thermoplastic resin by melt impregnation method includes the equipment for decomposing fiber loops into fiber bundles and pretreatment, and the fiber bundle independent channel 1 is connected with fiber pre-fluffing and preheating system 2 ; Molten resin fully impregnates fibers and molding equipment, and its melt inlet die 6 communicates with the fiber impregnated body 5 through the melt inflow channel 12, and is inclined upward at a certain angle. The thermal system 2 and the fiber impregnated body 5 can make the fibers enter the fiber impregnated body 5 horizontally, and the other end of the fiber impregnated body 5 is connected with the forming die 8 .

In addition, the melt inlet die 6, the fiber inlet die 4, the forming die 8 and the fiber impregnated body 5 are detachable and flexibly combined; the fiber bundle independent channel 1 is a fiber conduit; the fiber independent channel 1 is 4-layer distribution, each layer of fiber bundle channel 1 is unfolded side by side; the fiber pre-fluffing and preheating system 2 includes pre-fluffing and preheating guide rollers 3 or a support frame that can adjust the height and distance of the guide rollers; the fiber pre-fluffing There are 6 groups with the preheating guide roller 3, and 40 arc-shaped small grooves are opened on the surface of the guide roller circumferential direction, and the center distance between each guide groove is 15mm; the fiber pre-fluffing and the preheating guide roller 3 are electric Heating or oil heating, the preheating temperature is 80°C; the height and horizontal distance of the pre-fluffing and preheating guide rollers 3 can be adjusted freely; the melt inlet die 6 is at an angle of 45° upward to the horizontal; the fiber impregnated body 5 passes through The fiber input flow channel is connected with the fiber inlet die, and the fiber tension roller 7 is arranged in the cavity 15 in the fiber impregnated body 5, and the other end thereof is connected with the forming die 8 through the output flow channel 13; the cross section of the fiber input flow channel is circular shape, diameter 4mm; the cross-section of the output channel 13 of the impregnated body is circular in diameter 4mm; the cross-section of the fiber tension roller 7 has 6 arc-shaped or concave polygonal small grooves with concave characteristics; the forming port The mold 8 is fixed on the outer wall of the fiber impregnated body 5 by bolts, and can be disassembled and replaced freely. There is also a resin collection device 9 on the outside of the forming die 8; the cross section of the flow channel of the forming die 8 is circular and flows along the melt direction, the diameter of the cross section decreases gradually, the diameter of the initial section is 4mm, and the diameter of the end section is 3mm; Have small groove 17 between die holes.

In the preparation method, the fiber pre-fluffing and pre-heating guide roller 3 can be heated by electricity or oil, and the pre-heating temperature is 80° C., and the rest are the same as the first embodiment.

Claims (18)

1. the former of a fiber reinforced thermoplastic resin, is characterized in that, comprising:

Fibrous loop resolves into fibre bundle and pretreated equipment, and its fibre bundle autonomous channel (1) is connected with pre-heating system (2) with fiber is pre-fluffy;

Molten resin fully floods and former fiber, its melt inlet mouth mould (6) communicates with fiber impregnation body (5) by melt flow channel (12), and be tilted to certain angle, fiber entry mouth mould (4) is in order to connect fiber fluffy and pre-heating system (2) and fiber impregnation body (5) in advance, can make fiber level enter fiber impregnation body (5), the other end of fiber impregnation body (5) is connected with molding port mould (8).

2. the former of fiber reinforced thermoplastic resin according to claim 1, is characterized in that, detachable and flexible combination between described melt inlet mouth mould (6), fiber entry mouth mould (4), molding port mould (8) and fiber impregnation body (5).

3. the former of fiber reinforced thermoplastic resin according to claim 1, is characterized in that, described fibre bundle autonomous channel (1) is fiber duct.

4. the former of fiber reinforced thermoplastic resin according to claim 1, is characterized in that, fibre bundle autonomous channel (1) is 1 ~ 4 layer of distribution, and launch side by side every layer of fibre bundle autonomous channel (1).

5. the former of fiber reinforced thermoplastic resin according to claim 1, is characterized in that, described fiber pre-fluffy with pre-heating system (2) in comprise pre-fluffy and pre-heated godet roll (3).

6. the former of fiber reinforced thermoplastic resin according to claim 5, it is characterized in that, the pre-fluffy and pre-heated godet roll (3) of described fiber has 4 ~ 6 groups, has 15 ~ 40 road arc minor grooves, the centre-to-centre spacing 15 ~ 22mm between every guide groove along the surface of deflector roll circumferencial direction.

7. the former of according to claim 5 or 6 described fiber reinforced thermoplastic resins, is characterized in that, the pre-fluffy and pre-heated godet roll (3) of described fiber is electrical heating or oil heating, and preheat temperature is at 80 ~ 250 ℃.

8. the former of fiber reinforced thermoplastic resin according to claim 5, is characterized in that, pre-fluffy and pre-heated godet roll (3) but height and horizontal range free adjustment.

9. the former of described fiber reinforced thermoplastic resin according to claim 1 and 2, is characterized in that, melt inlet mouth mould (6) and level are 30 a ° ~ 45° angle degree obliquely.

10. the former of fiber reinforced thermoplastic resin according to claim 1, it is characterized in that, fiber impregnation body (5) is connected with fiber entry mouth mould (4) by the fiber input duct, cavity (15) in fiber impregnation body (5) has fiber tension roller (7), and its other end is connected with molding port mould (8) by delivery channel (13).

11. the former of fiber reinforced thermoplastic resin, is characterized in that according to claim 10, fiber input duct cross section is rounded, diameter 2 ~ 5mm.

12. the former of fiber reinforced thermoplastic resin, is characterized in that according to claim 10, the rounded diameter 2.5 ~ 5mm of the cross section of the delivery channel of impregnating (13).

13. according to the former of fiber reinforced thermoplastic resin according to claim 10, it is characterized in that, the cross section of fiber tension roller (7) has circular arc or the polygonal minor groove of indent of 2 ~ 6 indent features.

14. the former of fiber reinforced thermoplastic resin according to claim 2, it is characterized in that, molding port mould (8) is bolted on the outer wall of fiber impregnation body (5), and can freely dismantle and change, and the outside of molding port mould (8) also has resin gathering-device (9).

15. the former of according to claim 1 or 14 described fiber reinforced thermoplastic resins, it is characterized in that, the cross section of molding port mould (8) runner is rounded, along the melt flows direction, the diameter of cross section reduces gradually, the diameter in initial cross section is 3 ~ 5mm, and the diameter of tail end section is 2.5mm ~ 3.5mm.

16. the former of according to claim 1 or 14 described fiber reinforced thermoplastic resins, it is characterized in that, the die orifice outer surface of molding port mould (8) and vertical direction are the angle of downward 15 ° ~ 60 °, have little groove (17) between the mouth nib on exit face.

17. the preparation method of a fiber reinforced thermoplastic resin, its step comprises:

(1) 20 ~ 40 bundle fiber is by behind autonomous channel separately, the mode that arranges with " one " word enters fiber fluffy and pre-heating system (2) in advance, when fibre bundle passes through pre-heated godet roll (3), fiber contacts with the deflector roll arc-shaped surface, under the stretching action of tractive force, fibre bundle is cloth or band shape, and fibre bundle has played pre-fluffy processing effect;

(2) after the fibre bundle level after pre-fluffy and preheating is led fiber entry mouth mould (4), impregnating fiber hand-hole, staggeredly up and down pass fiber tension roller (7) in impregnating, fibre bundle is being cloth shape or band shape with fiber tension roller (7) when contacting;

(3) infiltrate good long fibre delivery channel (14), molding port mould (8) by impregnating together with material stream.

18. the preparation method of described fiber reinforced thermoplastic resin, is characterized in that according to claim 17, the pre-fluffy and pre-heated godet roll (3) of described fiber but electrical heating or oil heating, preheat temperature is at 80 ~ 250 ℃.

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